Core breaker and puller for rock-drills



(No Model.)

F. D. PARKER.

GORE BREAKER. AND FULLER FOR ROUK DRILLS.

RN 5K WW Patented Dec. 1, 1885.

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FRED D. PARKER, OF DENVER, COLORADO.

CORE BREAKER AND PULLER FOR ROCI(==DRILLS.

$PECIFIOATION forming part of Letters Patent No. 331,319, dated December 1, 1885.

Application filed July 1, 1885. Serial No. 170,392. (No model.)

To all whom it may concern.-

I Be it known that I, FRED D. PARKER, a citizen of the United States, residing at Denver, in the county of Arapahoe and State of Colorado, have invented a new and useful Core Breaker and Puller for Annular Rock- Drills, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to improvements in core breakers and pullers for annular rock or earth drills; and the object of my improvement is to provide a device which upon being introduced into the drill-stock or attached thereto allows the core left by the annular drill to pass freely into and through the device, but which firmly grasps, breaks, and extracts said core when the drill is withdrawn. This object I attain by the mechanism illustrated in the accompanying drawings, in which similar letters refer to corresponding parts.

Figure 1 is a sectional side view of my improved device cut longitudinally through the center. Fig. 2 is a longitudinal section of the drill-stock and drill-head, showing the position of my device within the drill-stock.

The device consists of a hollow cylinder, a, one or more rings, b, an angular collar, 0, and a shoe, d, as hereinafter fully described and set forth. The cylinder a has a shoulder, a, upon its concave surface, against which shoulder one of the rings brests when in a horizontal position. The rings 2) are placed loosely within the cylinder, each ring resting loosely upon the one directly below it, in case more than one ring is used, as shown in Fig. 1.

Within the cylinder a and beneath the rings bis the angular collar 0. This collar fits snugly within the cylinder, and is held in position from below by the shoe d, which is screwed into the cylinder, as shown, and forms a shoulder upon which the collarc rests. The upper edge of collar 0 is shown angular or oblique in the drawings, as this shape is considered preferable in the construction of my device. I do not, however, limitmyself to the angular or oblique form of collar, as any other form of collar offering a small bearing on one side for rings 1) may be used. Between the shoulder a and the collar 0 is the recess 0, in which the ring or rings b are confined.

In Fig. 2, 'e is a drill-stock, andf the drillhead.

By removing the drill-head my improved device is placed within the drill-stock, as shown, after which the drill-head is replaced, forming a shoulder against which the lower edge of the device rests, being thus supported and held in position.

WVithin the drill-stock and above the device is formed a shoulder, e, which holds the device in position from above.

It is not necessary that my device should he placed within the drill-stock, as shown in Fig. 2, as the diamonds or other cutting device may beset in the shoe d, which is securely attached to the cylinder a, as shown. The drill-stock may then be attached to the upper part, a of the cylinder a, which is threaded for the purpose, as shown. The drill is then ready for action.

When my improved device is placed within the drill-stock, as shown in Fig. 2, it fits loosely within the same; hence the water from the pump which flows through the center of the device and its accompanying drill-stock will also force its way between the two, if an outlet is offered. This is provided for by notches d, formed in the lower edge of the shoe (2. As the water is forced through these notches by pressure, it lubricates the entire device as it flows, thus reducing the friction between the two cylinders to a minimum, in consequence of which the device does not usually revolve with the drill stock; but if undue friction should result from the presence of silt between the cylinders my device may revolve with the drill without retarding its action or interfering with its working.

In the operation of my device I first insert a small section of core, 9, within the cylinder a far enough to allow it to be grasped by the ring or rings 12. v This is done to fullyinsure the proper introduction of the core into the rings [2 when the drill is in operation. As the drillis pushed forward to its work, the shoulder a forces the rings 6 with it, should they meet with any resistance. As a stream of water is forced through the mechanism, all tendency to clog is obviated. As the drill is withdrawn, the rings 1) drop to the oblique position shown in Fig. I, being supported underneath their one side only by the small bearing-namely, the top of collar c which position they usually assume while the core is being formed, unless obstructed by debris. The rings then grasp the core tightly at two points in their inner circumference directly opposite each other. These two points of contact would be connected by a diameter drawn from the highest point within the inner circumference of the rings to the lowest point in the same circumference. The core being grasped tightly by the rings at the points mentioned, the strain upon the same is increased as the power is applied, causing a compound strain composed of a strong side pressure and a direct longitudinal strai n, which breaks off the core and forces it to the position shown by the oblique dotted lines in Fig. 1, after which all the core in the drillstock is drawn out with the same. The oblique or angular shape of the upper edge of the collar 0 increases the leverage of the rings in breaking the core.

In any work that may approximate the horizontal the rings are thrown to position by the stream of water which flows through them.

If it should be deemed expedient, for any cause, to withdraw the drill from its work without breaking and pulling the core with it, the pump may be reversed, thus causing a backward flow of water through the device, forcing the rings from their angular to a horizontal position, when they will pass freely over the core without friction.

What I claim as my invention, and desire to secure by Letters Patent, is

In a core breaker and puller for annular rock-drills, the combination of the hollow cylinder a with the ring or rings 1), arranged to operate within the cylinder to at an angle to its inside walls, said ring or rings held in respective positions within by angular or oblique collar 0 on the one side, and shoulder a on the, other, substantially as set forth.

FRED D. PARKER.

In presence of- SAM MILTON, M. R. MODERMOTT. 

